This jutsu deserved more respect from Kishi, it’s Orochimarus last big gambit against Itachi, it’s literally his namesake. It’s stated to be his
strongest jutsu from years of research. Superior to his version of Edo Tensei.
And it’s called a dragon god. The only time another snake was called a dragon….
Is when this sexy character announces his metaphorical transformation.
Implying, perhaps, this likewise is his answer to Jiraiya’s imperfect Sage mode?